This test has started failing with the message "FAIL: scrollTop is 600px, but should be more than 600px", because it expects the scrolling that it triggers to be instantaneous and it is not anymore. The easiest thing here is to disable scroll animation as was done for several other tests in r290548.
Created attachment 458574 [details] Patch
Committed r293620 (250126@main): <https://commits.webkit.org/250126@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 458574 [details].
<rdar://problem/92532244>